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Sexual Precocity in a 16-Month-Old L1 Q" p6 ]+ X5 o$ T* {
Boy Induced by Indirect Topical
. D; t' |9 w, v* n4 N8 qExposure to Testosterone# l: ~* L6 |& a7 |' M
Samar K. Bhowmick, MD, FACE,1 Tracy Ricke, MD,2
0 O- `% u0 ~% V* ?, }3 a* mand Kenneth R. Rettig, MD1
; g( q+ E1 \4 x" Y" y4 S* EClinical Pediatrics% g% Q$ v2 K- X4 m2 `: l
Volume 46 Number 62 h" g o, s" n: m
July 2007 540-543/ ?( x" L& V: \8 V! W e, c
© 2007 Sage Publications3 d6 \( `! G" Y; Z& ^7 y( X
10.1177/0009922806296651! ]* g+ @; v2 d$ t+ E2 Q- y
http://clp.sagepub.com
) B, I' N0 U6 e2 s0 r# P0 t) Yhosted at
/ R' |9 R+ @: A Y, u. v" M- mhttp://online.sagepub.com
# v" ~0 v, G5 @0 d1 vPrecocious puberty in boys, central or peripheral,
4 B' k) P0 R- g3 h' b lis a significant concern for physicians. Central4 n/ Y) h R& r4 N4 f" P C
precocious puberty (CPP), which is mediated
; D7 N x- q4 H- a9 g& a" g& Jthrough the hypothalamic pituitary gonadal axis, has, N: Q6 O( @; s- K5 o: q8 ^
a higher incidence of organic central nervous system
% R3 {5 A/ k. |/ N* klesions in boys.1,2 Virilization in boys, as manifested
9 d7 n5 v5 _% J; kby enlargement of the penis, development of pubic
) w$ [: a; |# N) ]2 _hair, and facial acne without enlargement of testi-
" y9 J1 n# p* f. ]9 H2 {" _cles, suggests peripheral or pseudopuberty.1-3 We6 U L% E' k' S& Z
report a 16-month-old boy who presented with the
/ Z f2 I' q) j9 e; \6 Kenlargement of the phallus and pubic hair develop-$ P, B0 g5 u- K; t6 q4 c4 k) d
ment without testicular enlargement, which was due
, h/ T" p; y) A, _4 _ [* qto the unintentional exposure to androgen gel used by
$ q7 g; ?! X+ T1 H# t) cthe father. The family initially concealed this infor-& W7 `2 E4 z8 S- Q2 l! ^9 W
mation, resulting in an extensive work-up for this v0 v9 `8 ?. }5 k& }
child. Given the widespread and easy availability of/ K0 c4 b8 T+ g- \
testosterone gel and cream, we believe this is proba-
0 |9 h+ c- u# h' V/ @bly more common than the rare case report in the+ e9 U W0 Y% n
literature.4
( V% {8 G/ e' l! U" kPatient Report
6 c$ }# z, z5 a/ uA 16-month-old white child was referred to the
/ R# h5 |+ }' z+ P3 Eendocrine clinic by his pediatrician with the concern
7 B( o) l0 v# n' `- [of early sexual development. His mother noticed! [% X8 l+ _1 l9 i# L4 ^
light colored pubic hair development when he was- S# A; V! P! |( Z# X& ^3 R
From the 1Division of Pediatric Endocrinology, 2University of! i; O2 b' B$ n- e1 w
South Alabama Medical Center, Mobile, Alabama.
+ ]+ ^5 Q! Y. T9 ?5 F% ^Address correspondence to: Samar K. Bhowmick, MD, FACE,
1 l% w- o( L4 f. E% UProfessor of Pediatrics, University of South Alabama, College of2 \( T. y& B9 W, g2 @
Medicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;* v; {/ _, y( n! [+ M. l
e-mail: [email protected]./ H& |# A f8 q! G R" U
about 6 to 7 months old, which progressively became5 I3 \# o! K/ |6 v4 |$ o3 h
darker. She was also concerned about the enlarge-
# z6 R% e& k) oment of his penis and frequent erections. The child8 T. s4 Y1 D$ |, o r: n
was the product of a full-term normal delivery, with
) m3 J# A# a% q# Ja birth weight of 7 lb 14 oz, and birth length of M2 E$ d4 |! q9 W/ q
20 inches. He was breast-fed throughout the first year( s2 V0 A) @& i
of life and was still receiving breast milk along with
: }2 ]2 |1 G0 ~# @5 _$ p2 P/ Zsolid food. He had no hospitalizations or surgery,
7 o1 ?( Q4 B3 {" Y; O# P/ ~6 }and his psychosocial and psychomotor development. c: V Y( x% k* V7 g3 Y/ I
was age appropriate.
, Z! F5 O3 R; `0 n9 b& CThe family history was remarkable for the father,
" n; ?' c1 n+ z, b# H6 B6 Ywho was diagnosed with hypothyroidism at age 16,
! Z' M* \1 F4 C) Cwhich was treated with thyroxine. The father’s
& e" t5 q+ y" ]" z. R- I4 Yheight was 6 feet, and he went through a somewhat
- Y; v# q! i/ |& D$ j9 eearly puberty and had stopped growing by age 14.
( D$ A/ H7 |) X& Q: jThe father denied taking any other medication. The, m- b' P( F. V4 J" Q9 H
child’s mother was in good health. Her menarche
/ j9 C* s& |# ?4 ~/ Vwas at 11 years of age, and her height was at 5 feet
# m# }# x2 X7 B% y4 ]+ _. X5 inches. There was no other family history of pre-8 u! y1 {4 }) K
cocious sexual development in the first-degree rela-1 f. b1 M* H* B @! N6 {& z6 K7 {
tives. There were no siblings.; ^- V- i* j$ Q" y- D2 [
Physical Examination
7 @* Y9 ^8 U8 LThe physical examination revealed a very active,
; c" ]: B2 a: a3 B b: C1 Eplayful, and healthy boy. The vital signs documented
' B1 M# K2 o; G" u2 Oa blood pressure of 85/50 mm Hg, his length was
% i1 M5 z5 y( Y; `6 K90 cm (>97th percentile), and his weight was 14.4 kg- i' \) ]9 p/ S. V2 V
(also >97th percentile). The observed yearly growth
e5 ~& f: K% l! K$ X4 f* R' Vvelocity was 30 cm (12 inches). The examination of
$ Q2 Y- m- d. `$ A/ othe neck revealed no thyroid enlargement." t6 w- L6 Z6 @( _, N- N
The genitourinary examination was remarkable for7 f* g, b$ h3 [, H! [' h
enlargement of the penis, with a stretched length of( o( r' {' x0 m1 q3 T$ r
8 cm and a width of 2 cm. The glans penis was very well
" x$ H+ C" Z8 N4 Bdeveloped. The pubic hair was Tanner II, mostly around
1 q( i) j! h) u2 G540
3 V3 r& ]8 Q5 m5 c! lat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from D, P( ^ p8 x" d/ k/ f6 ]- x" G
the base of the phallus and was dark and curled. The! l b& b$ \' T% U! }) x
testicular volume was prepubertal at 2 mL each.
6 A- [* k9 d, M F3 ^+ wThe skin was moist and smooth and somewhat
3 b% s9 b* r1 e9 t1 ]& [; b0 Qoily. No axillary hair was noted. There were no y. _; i( D; d; x B$ {& A
abnormal skin pigmentations or café-au-lait spots.4 m4 t2 [; ?6 k+ ~; u: {9 e- Q1 m2 b4 N1 q
Neurologic evaluation showed deep tendon reflex 2+
( _8 W/ w! ]* B, R6 G2 Q% Vbilateral and symmetrical. There was no suggestion) J0 X( [* C# }/ P9 ?
of papilledema.6 [) S) d& W: @- y- A/ R
Laboratory Evaluation( f8 y; m' o, f, w+ r
The bone age was consistent with 28 months by
$ f# ^8 ?8 r% O# [' H0 Susing the standard of Greulich and Pyle at a chrono-. @ F; O/ e2 c8 k
logic age of 16 months (advanced).5 Chromosomal3 |' v, t1 m0 D; s! [
karyotype was 46XY. The thyroid function test+ E7 L* `0 y" i0 K% B: p9 K% ~
showed a free T4 of 1.69 ng/dL, and thyroid stimu-1 K7 u8 T- W7 T3 w: ]9 i; i
lating hormone level was 1.3 µIU/mL (both normal).# \* C5 n' H" r M
The concentrations of serum electrolytes, blood, W+ K, @' G* {- y1 M
urea nitrogen, creatinine, and calcium all were6 {& e2 a" z5 k! B" o! j
within normal range for his age. The concentration$ o3 z+ Z7 y. o/ H$ U2 |1 c* n
of serum 17-hydroxyprogesterone was 16 ng/dL
& U( | T, Q; k; O(normal, 3 to 90 ng/dL), androstenedione was 20
# Y9 c. R3 N/ ~: k" dng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-
* k6 i: V' X2 N4 U4 c2 E, y' Yterone was 38 ng/dL (normal, 50 to 760 ng/dL),
z8 ?5 c \# k2 f$ z% r$ h' Edesoxycorticosterone was 4.3 ng/dL (normal, 7 to1 U2 b9 @1 F/ A8 u- d
49ng/dL), 11-desoxycortisol (specific compound S)9 \6 M7 r9 z9 g0 \/ W; Y, W
was 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-. ^6 k) |1 p5 ~ w0 M. a T
tisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total! d$ `; R3 J6 a' j0 W
testosterone was 60 ng/dL (normal <3 to 10 ng/dL),
, @5 |$ P" B3 [9 @0 land β-human chorionic gonadotropin was less than
5 _( F# }4 m4 @# g3 m1 O- j5 mIU/mL (normal <5 mIU/mL). Serum follicular
- x$ W2 y% h; L/ ~% q2 E4 Astimulating hormone and leuteinizing hormone! k: A5 J# n( E4 g1 [7 q
concentrations were less than 0.05 mIU/mL: U O Z2 j" k$ s1 W
(prepubertal).
8 Q1 e* k& @6 f8 w; `" cThe parents were notified about the laboratory, c' V; V% j; q1 t" q5 O* R ?
results and were informed that all of the tests were& D) h. g( I. D' C
normal except the testosterone level was high. The
5 L9 J3 @, t; i% F/ efollow-up visit was arranged within a few weeks to! L4 ^, x/ W/ s& F6 X7 n- O
obtain testicular and abdominal sonograms; how-
) g) y' t) m: u! w; }ever, the family did not return for 4 months./ C% l! O+ d6 L; ~# R# L# _9 S
Physical examination at this time revealed that the1 J, _. X- ~9 j1 o
child had grown 2.5 cm in 4 months and had gained6 _1 l( P4 l; H: A6 [* p' Z
2 kg of weight. Physical examination remained2 G2 P8 A5 K' i
unchanged. Surprisingly, the pubic hair almost com-
# W$ w, T6 }* H' L7 @; Gpletely disappeared except for a few vellous hairs at
" X; {8 ?5 w3 A7 R1 o3 Ythe base of the phallus. Testicular volume was still 25 A& W" d! {9 k6 ]# ]
mL, and the size of the penis remained unchanged.
( ]: t7 D5 g; q9 o% E! v$ R2 @+ @The mother also said that the boy was no longer hav-
& ~$ L0 J" y4 R, }; m5 wing frequent erections.
9 I9 o' T- l! x; fBoth parents were again questioned about use of! I/ y+ z0 B6 {
any ointment/creams that they may have applied to3 I& ~" }) ~$ z& S8 \6 P6 {
the child’s skin. This time the father admitted the" z/ }; i" @7 H h
Topical Testosterone Exposure / Bhowmick et al 541% _( Z0 q' |5 o
use of testosterone gel twice daily that he was apply-
( w: j( O& ]% b2 Ping over his own shoulders, chest, and back area for
8 \2 i0 ?" K9 ra year. The father also revealed he was embarrassed
5 H+ B) P# S s, R9 f6 }# ]to disclose that he was using a testosterone gel pre-
! w1 H$ O4 B8 c1 y0 I- |# Oscribed by his family physician for decreased libido# ?3 s! \& R* `3 e* D6 z
secondary to depression.0 U- S2 ?7 [0 z; c( I1 N( C* {
The child slept in the same bed with parents.+ c( ?2 P% D! m x; h( S
The father would hug the baby and hold him on his+ Z$ s4 n4 i0 C7 L4 V
chest for a considerable period of time, causing sig-
5 c* K% I$ i8 enificant bare skin contact between baby and father.9 d- ?" l; s! U
The father also admitted that after the phone call,3 g# g1 g& _7 V+ L- ]6 }
when he learned the testosterone level in the baby7 ^( T, Q |% w
was high, he then read the product information1 t8 }* `, R) |/ `+ U
packet and concluded that it was most likely the rea-
. T% p; V5 |2 m- t( M8 Xson for the child’s virilization. At that time, they
; I9 u+ p, _1 U) h0 P' v0 Q; f5 Xdecided to put the baby in a separate bed, and the
* s6 Y" T8 ]1 M; h( C ^father was not hugging him with bare skin and had
7 z5 \5 p' ?% lbeen using protective clothing. A repeat testosterone" \: i: l* M/ M X2 K- O1 C+ J# ~
test was ordered, but the family did not go to the3 L2 e6 X$ Y0 A4 X; }4 z, M1 ^6 x" Q& Q# p
laboratory to obtain the test.& u2 ? y9 F2 m; m; V" s& D0 q
Discussion1 h* X) h7 U! b* s
Precocious puberty in boys is defined as secondary7 t4 D4 ]& j! P6 {
sexual development before 9 years of age.1,4: M O, t, ?6 a0 Z0 @
Precocious puberty is termed as central (true) when
. x( K9 s$ H; fit is caused by the premature activation of hypo-
3 ?( }+ [+ d5 b7 j4 z! d, D2 hthalamic pituitary gonadal axis. CPP is more com-3 g _; h6 ~7 T" M8 f% j
mon in girls than in boys.1,3 Most boys with CPP
% ^- G7 _, W' imay have a central nervous system lesion that is, p- i2 M" _# C1 M8 ~ {
responsible for the early activation of the hypothal-3 s$ u. g) _# r5 T* E. l+ G
amic pituitary gonadal axis.1-3 Thus, greater empha-
9 x7 M# O& Z# bsis has been given to neuroradiologic imaging in
) e" k$ T. x9 v& a5 vboys with precocious puberty. In addition to viril-8 L5 p1 ~! X e
ization, the clinical hallmark of CPP is the symmet-/ U4 h2 D# T$ K7 k+ d- X( @
rical testicular growth secondary to stimulation by
- b& m+ S8 T7 \# ugonadotropins.1,3' R& O4 q3 z, O* J3 u% i/ i
Gonadotropin-independent peripheral preco-
7 @$ o# M- e" m3 i7 gcious puberty in boys also results from inappropriate
6 X0 p2 B' H( t! {+ M* x: P5 ?androgenic stimulation from either endogenous or, x/ r9 w5 I2 Y/ h" G
exogenous sources, nonpituitary gonadotropin stim-
1 J- j& ^: B- Dulation, and rare activating mutations.3 Virilizing9 G* y e6 e+ E8 I% d
congenital adrenal hyperplasia producing excessive4 ~1 Z$ m% ~$ }9 ]: ?$ p
adrenal androgens is a common cause of precocious
% I4 g0 C/ e! s% o- apuberty in boys.3,4 H0 Z' ]# O5 ~" F6 g6 T& D
The most common form of congenital adrenal/ D- y$ `- k% C. U
hyperplasia is the 21-hydroxylase enzyme deficiency.
1 V* Y: K9 ]' f- a# BThe 11-β hydroxylase deficiency may also result in
! E6 q1 j% k- X- I) ?3 Cexcessive adrenal androgen production, and rarely," o5 G, e" b4 b% ~2 d
an adrenal tumor may also cause adrenal androgen
! G; @0 A0 ?5 r! \, }excess.1,3
, _7 Y* E- D* q/ o7 g) _4 yat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
8 K6 h! C) y( ~$ S0 M2 P' ?- W m# Z542 Clinical Pediatrics / Vol. 46, No. 6, July 2007! _1 l" n: ?9 F' L" w! {
A unique entity of male-limited gonadotropin-
9 E: d' G2 M: U5 K7 N$ rindependent precocious puberty, which is also known
7 D/ x$ b9 {( s+ z: D b) Uas testotoxicosis, may cause precocious puberty at a
0 r! g3 n n5 X* f4 M$ |0 V8 p2 cvery young age. The physical findings in these boys
j! A! d# s5 Y+ f' ?9 Bwith this disorder are full pubertal development,5 F( a2 ~5 c) G: M3 D
including bilateral testicular growth, similar to boys
. P9 c5 a( x! H+ m, j* vwith CPP. The gonadotropin levels in this disorder! A0 E& h9 S, y U$ L, e
are suppressed to prepubertal levels and do not show
% } O6 A5 T' N j. V% xpubertal response of gonadotropin after gonadotropin-
8 u9 B1 p1 j; M$ Yreleasing hormone stimulation. This is a sex-linked
) I; ^0 G9 o: c( [$ x* g* oautosomal dominant disorder that affects only/ F$ D/ C1 u/ g. ?, D$ ]
males; therefore, other male members of the family
% ~% L4 \# i# ~% ^8 V: emay have similar precocious puberty.3+ u# l3 f* i7 O. m
In our patient, physical examination was incon-
' N9 Z; Y* S+ D& esistent with true precocious puberty since his testi-: o2 g* p7 m1 h U( O% O
cles were prepubertal in size. However, testotoxicosis, ]9 L" w" f1 q, g$ J
was in the differential diagnosis because his father3 d; U9 U5 g/ e4 Q$ U
started puberty somewhat early, and occasionally, u0 m, L/ B2 G7 Q0 P
testicular enlargement is not that evident in the6 P* T+ s( R n. ^" l& M9 b
beginning of this process.1 In the absence of a neg-
- Y) i. p3 A! ]; g% u4 \ative initial history of androgen exposure, our6 l. L/ M! W3 |( z
biggest concern was virilizing adrenal hyperplasia,; @7 I) `; |6 a5 \' j4 c7 y; J
either 21-hydroxylase deficiency or 11-β hydroxylase# Y9 @: ~6 O( {3 u
deficiency. Those diagnoses were excluded by find-
- F" t& o. K$ @4 ving the normal level of adrenal steroids.& u1 c) ]/ k( `3 _( M0 O
The diagnosis of exogenous androgens was strongly
6 x' k/ P9 A B: ]suspected in a follow-up visit after 4 months because
# }4 S* ~! T8 h1 {0 C. o0 x9 ?the physical examination revealed the complete disap-
+ S9 T, M( f' npearance of pubic hair, normal growth velocity, and/ Z) Y- I$ x4 r8 [; ? j6 d7 L: }
decreased erections. The father admitted using a testos-
6 [. J3 n6 o2 `$ Uterone gel, which he concealed at first visit. He was* T2 {# Z( x* l7 _' @; \& t% D. B
using it rather frequently, twice a day. The Physicians’
( [$ v5 d0 C) ODesk Reference, or package insert of this product, gel or
. h5 {4 y$ a: S5 s* }cream, cautions about dermal testosterone transfer to( ?" l" R8 N1 K8 _2 v
unprotected females through direct skin exposure.; Y3 P2 G+ V4 d
Serum testosterone level was found to be 2 times the
( Q+ ]' _3 _2 I9 W" z% mbaseline value in those females who were exposed to
2 t; D6 o" ~7 `# ?) Zeven 15 minutes of direct skin contact with their male
' P. r. r6 P% y8 Apartners.6 However, when a shirt covered the applica-
7 M: d0 E# O, `' Jtion site, this testosterone transfer was prevented.& ]8 h y) y+ E s) l" {
Our patient’s testosterone level was 60 ng/mL,. e }6 ?; t+ C) k0 t% j; \
which was clearly high. Some studies suggest that
# s2 J/ ^' i% y0 e9 ]- J' V/ b# Kdermal conversion of testosterone to dihydrotestos-
" M, v3 |! G6 h: s* E4 t% P0 Vterone, which is a more potent metabolite, is more% ]$ v) i- C0 b. K
active in young children exposed to testosterone$ u' `# C+ |1 ?: F
exogenously7; however, we did not measure a dihy-
% L; f) Z2 @) C& \# N; Jdrotestosterone level in our patient. In addition to9 U7 s0 @1 T/ Q! c
virilization, exposure to exogenous testosterone in& ]) \3 _$ X% m2 k: _. `
children results in an increase in growth velocity and
0 z& U0 s, s# m- W0 Jadvanced bone age, as seen in our patient.
( b" Z9 T1 d5 \The long-term effect of androgen exposure during
' f+ Q4 `$ V8 s( ?4 @3 `early childhood on pubertal development and final7 t2 F0 u$ |6 a3 ?# f! H$ S p
adult height are not fully known and always remain
, J. m8 V1 I& {9 u3 N6 X( ^% xa concern. Children treated with short-term testos-
; e9 f, ~, E+ q" N$ Cterone injection or topical androgen may exhibit some
. [0 d |& e% ^/ i! U3 dacceleration of the skeletal maturation; however, after' K* A, \$ F7 G# _3 J
cessation of treatment, the rate of bone maturation4 x+ d, V! p/ W C) G) {( ^
decelerates and gradually returns to normal.8,94 `* L& _" h3 l9 ]# \1 ]) M
There are conflicting reports and controversy" K$ \; @5 d/ K
over the effect of early androgen exposure on adult# U3 h* M5 ^/ f# a# ?7 _
penile length.10,11 Some reports suggest subnormal% J* [: M! [" @- i
adult penile length, apparently because of downreg-
* j' L6 }7 N7 o* B6 z! [ulation of androgen receptor number.10,12 However,+ n$ L! N' k8 O: O2 E( X& j
Sutherland et al13 did not find a correlation between
- Z, V' T! }. ]- d( B6 w) e, vchildhood testosterone exposure and reduced adult0 b$ N% p) h) o5 l
penile length in clinical studies.
. ~, C. [! M% p6 TNonetheless, we do not believe our patient is9 K' m- v; ~. z# Q3 a
going to experience any of the untoward effects from
" ~; J' Q; h# l& e3 u* Btestosterone exposure as mentioned earlier because
" q( C, Z& P0 ]' @( v7 T7 L+ zthe exposure was not for a prolonged period of time.
( |6 q+ z# W s3 w& W% VAlthough the bone age was advanced at the time of
+ a, u1 J- ?+ h. l8 M+ b. s) ]diagnosis, the child had a normal growth velocity at
% x2 P1 U! q: |4 e" t- \# ethe follow-up visit. It is hoped that his final adult
D/ d$ U( |# ?6 [8 n& s$ Xheight will not be affected.
0 d+ L5 ? a, OAlthough rarely reported, the widespread avail-
$ E1 m6 m# ?% k4 a7 a/ vability of androgen products in our society may
1 Q* Z0 Q& G1 y0 s* ?indeed cause more virilization in male or female
- e8 g$ w2 b! W6 b' T- ^children than one would realize. Exposure to andro-& c$ ~3 d* S: k, F( v" U; A7 j3 o
gen products must be considered and specific ques-4 J/ A1 v/ g9 `1 p
tioning about the use of a testosterone product or s. s# q) P) W- |! O9 q
gel should be asked of the family members during
; t! g/ \- U% c6 i) Gthe evaluation of any children who present with vir-7 {2 D- J" n0 p9 B# W4 Y ]
ilization or peripheral precocious puberty. The diag-% M1 c, [: P: L3 q# M& ]- J
nosis can be established by just a few tests and by' r; R# j9 S4 u( ^7 E. B" w/ v
appropriate history. The inability to obtain such a; m) @6 S- V0 N: }' C3 l, k
history, or failure to ask the specific questions, may* N/ U+ t7 j+ t1 E
result in extensive, unnecessary, and expensive
1 q3 b" a8 ^7 `. i' R+ `investigation. The primary care physician should be* h$ ^0 O3 |7 {% h! E
aware of this fact, because most of these children
; Q8 ]# k" M3 T9 mmay initially present in their practice. The Physicians’
$ W0 q' z4 \3 x- F, F$ Z0 hDesk Reference and package insert should also put a0 \) K' m l) }& S. P
warning about the virilizing effect on a male or4 Y, A. y! q5 [3 \0 A
female child who might come in contact with some-
- t# ]3 Q; Z- `( ^9 a' lone using any of these products.
2 f1 G" f1 |8 {6 r; O; E% ~( LReferences( A1 L; I+ O4 a5 Z
1. Styne DM. The testes: disorder of sexual differentiation
- P2 B1 Y/ G8 u, {and puberty in the male. In: Sperling MA, ed. Pediatric. U$ @0 I0 O+ y8 i( q Q) F! ^
Endocrinology. 2nd ed. Philadelphia, PA: WB Saunders;/ \! A+ ?: [% f& c
2002: 565-628.
% d, g5 X( q( _' G$ `/ L2. Rivarola M, Belgorosky A, Mendilaharzu H, et al. Precocious6 D5 |. T$ I1 ?& u
puberty in children with tumours of the suprasellar pineal |
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